Accueil >
Production scientifique
|
|
Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics.
Auteur(s): Duri Agnès, Ballesta P., Cipelletti L., Bissig H., Trappe V.
(Article) Publié:
Fluctuation And Noise Letters, vol. 5 p.L1-L15 (2005)
Résumé: We use Time Resolved Correlation (TRC), a recently introduced light scattering method, to study the dynamics of a variety of jammed, or glassy, soft materials. The output of a TRC experiment is cI(t,t), the time series of the degree of correlation between the speckle patterns generated by the light scattered at time t and t+t. We characterize the fluctuations of cI by calculating their Probability Density Function, their variance as a function of the lag t, and their time autocorrelation function. The comparison between these quantities for a Brownian sample and for jammed materials indicate unambiguously that the slow dynamics measured in soft glasses is temporally heterogeneous. The analogies with recent experimental, numerical and theoretical work on temporal heterogeneity in the glassy dynamics are briefly discussed.
Commentaires: DuriFNL2005
|
|
|
|
Slow dynamics in glassy soft matter 
Auteur(s): Cipelletti L., Ramos L.
(Article) Publié:
Journal Of Physics: Condensed Matter, vol. 17 p.R253-R285 (2005)
Texte intégral en Openaccess : 
Ref HAL: hal-00004108_v1
Ref Arxiv: cond-mat/0502024
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Measuring, characterizing and modelling the slow dynamics of glassy soft matter is a great challenge, with an impact that ranges from industrial applications to fundamental issues in modern statistical physics, such as the glass transition and the description of out-of-equilibrium systems. Although our understanding of these phenomena is still far from complete, recent simulations and novel theoretical approaches and experimental methods have shed new light on the dynamics of soft glassy materials. In this paper, we review the work of the last few years, with an emphasis on experiments in four distinct and yet related areas: the existence of two different glass states (attractive and repulsive), the dynamics of systems very far from equilibrium, the effect of an external perturbation on glassy materials, and dynamical heterogeneity.
|
|
|
|
Direct experimental evidence of a growing length scale accompanying the glass transition
Auteur(s): Berthier L., Biroli G., Bouchaud J.P., Cipelletti L., El masri Djamel, L'Hote D., Ladieu F., Pierno Matteo
(Article) Publié:
Annual Review Of Nuclear And Particle Science, vol. 310 (5755) p.1797-1800 (2005)
Résumé: Understanding glass formation is a challenge, because the existence of a true glass state, distinct from liquid and solid, remains elusive: Glasses are liquids that have become too viscous to flow. An old idea, as yet unproven experimentally, is that the dynamics becomes sluggish as the glass transition approaches, because increasingly larger regions of the material have to move simultaneously to allow flow. We introduce new multipoint dynamical susceptibilities to estimate quantitatively the size of these regions and provide direct experimental evidence that the glass formation of molecular liquids and colloidal suspensions is accompanied by growing dynamic correlation length scales.
Commentaires: ISI Document Delivery No.: 995II Times Cited: 0 Cited Reference Count: 32 English Article
|
 |
Dynamical heterogeneities at the jamming transition of concentrated colloids.
Auteur(s): Cipelletti L.
Conference: 6th Liquid Matter Conference (Utrecht, Netherlands, FR, 2005-07-02)
|
|
Intrinsic aging and effective viscosity in the slow dynamics of a soft glass with tunable elasticity.
Auteur(s): Cipelletti L.
Conference: SoftComp Meeting (Leuven, Belgium, FR, 2005-01-20)
|
|
Dynamique hétérogène dans les systèmes colloïques concentrés.
Auteur(s): Cipelletti L.
Conference: GDR (Marseille, France, FR, 2005-10-17)
|
|
Dynamical heterogeneities at the jamming transition of concentrated colloids.
Auteur(s): Cipelletti L.
Conference: 5th International Discussion on Relaxations in Complex Systems (Lille, France, FR, 2005-07-07)
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 
